CN202121317U - Lightning protection device having overvoltage and overcurrent protection functions - Google Patents
Lightning protection device having overvoltage and overcurrent protection functions Download PDFInfo
- Publication number
- CN202121317U CN202121317U CN2011202083744U CN201120208374U CN202121317U CN 202121317 U CN202121317 U CN 202121317U CN 2011202083744 U CN2011202083744 U CN 2011202083744U CN 201120208374 U CN201120208374 U CN 201120208374U CN 202121317 U CN202121317 U CN 202121317U
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- protection device
- lightning protection
- overcurrent
- signal line
- serially connected
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Abstract
The utility model discloses a lightning protection device having overvoltage and overcurrent protection functions, comprising a transient voltage suppressor (TVS1) serially connected between two signal lines, two polar gas discharge tubes (GD T1, GD T2) serially connected between the two signal lines and a ground wire respectively, and two variable resistors (PTC1, PTC2) serially connected between the input ends and output ends of the two signal lines. By using the two polar gas discharge tubes having the same type and same order magnitude, the protection order magnitudes of the signal lines are equal, and the protection level of each signal line is improved; and the two variable resistors can effectively suppress the damage of continuous overcurrent to a device, having overcurrent and overvoltage dual-protection effects. Further, the lightning protection device has the advantages of simple structure, and low cost.
Description
Technical field
The utility model relates to a kind of lightning protection device, especially relates to a kind of lightning protection device with overvoltage, the two protections of overcurrent.
Background technology
In industrial control system; Signal and communication circuit (like RS232/422/485 agreement and token ring and electric current loop) need add and put lightning protection device; By lightning protection device the surge in the industrial network signal is effectively suppressed; Can reduce the signal interruption that surge brought in the industrial control network to greatest extent, prevent device damage.
As shown in Figure 1, be the electrical block diagram of existing a kind of lightning protection device.This lightning protection device comprises: one three utmost point gas discharge tube GDT1 connects with holding wire and ground wire respectively; Big electric current is used for releasing; Be serially connected in resistance R 1 and resistance R 2 on two signal line respectively; Be connected the Transient Suppression Diode TVS1 between two signal line, and be connected to Transient Suppression Diode TVS1 and TVS3 between two signal line and the ground wire.
This lightning protection device has following shortcoming: the protective capacities of two air chambers of three present utmost point gas discharge tube GDT1 self is owing to the reason of production technology is unequal; Distribute energy balancedly; And every the protection energy by the guard signal line is uncertain; As easy as rolling off a logly cause the current drain ability on every circuit inequality, make two signal line wherein one by protective capability than a little less than very, can't resist the impact of big surge energy and make the damage of rear end equipment.In addition, series connection ordinary fixed resistance R 1 plays coupling with R2 between three utmost point gas discharge tube GDT1 and Transient Suppression Diode TVS1, assists Transient Suppression Diode TVS1 and three utmost point gas discharge tube GDT1 to reach action consistency; But; The resistance of conventional, electric-resistance is fixed; When passing through the overcurrent that continues, resistance R 1 can not increase along with continuing of overcurrent time with resistance R 2 current limiting capacities own, so the current-limiting protection ability of fixed resistance is very limited; Can not be to the overcurrent on the abundant containment circuit, the safety of the rear end equipment that can't adequately protect be arranged.
Figure is the electrical block diagram of existing another kind of lightning protection device shown in 2.Compared to Figure 1, respectively resistance R 1 and resistance R 2 are replaced to inductance L 1 and inductance L 2, utilize the electric current time delay in the inductance coil of flowing through, assist Transient Suppression Diode TVS1 and three utmost point gas discharge tube GDT1 to reach action consistency.
This lightning protection device has following shortcoming: on the one hand, this lightning protection device also because the protective capacities of two air chambers of three utmost point gas discharge tube GDT1 self is unequal, exists the protective capability of two signal line that difference is arranged; On the other hand; Lightning protection device only has overvoltage protection; And do not have overcurrent protection: because the effect that inductance component self does not have energy absorption; The absorption of the overcurrent energy that occurs in inductance L 1 and 2 pairs of circuits of inductance L is very little, through inductance L 1 and inductance L 2 size of current not change basically afterwards, so can not play the protection to overcurrent.
The utility model content
The utility model proposes a kind of lightning protection device with overvoltage, the two protections of overcurrent, can effectively suppress to continue overcurrent, also has the overcurrent-overvoltage duplicate protection.
The utility model adopts following technical scheme to realize: a kind of lightning protection device with over-voltage over-current protection comprises: be serially connected in the Transient Suppression Diode TVS1 between two signal line; Two be serially connected in respectively two signal line and and ground wire between the two poles of the earth gas discharge tube GDT1 and GDT2; Two are serially connected in the input of two signal line and variable resistor PTC1 and PTC2 between the output.
In a preferred embodiment, lightning protection device also comprises two Transient Suppression Diode TVS2 and the TVS3 that is serially connected in respectively between two signal line and the ground wire.
Compared with prior art, the utlity model has following beneficial effect:
The utility model has adopted the two poles of the earth gas discharge tube GDT1 and the GDT2 of two same model equal order; Be connected over the ground with two signal line respectively; Can from solved existing lightning protection device in essence, adopt one three utmost point gas discharge tube to the unbalanced shortcoming of every signal line protection class; Make the protection magnitude of every signal line equate, thereby play current potential between balanced line better, improve the protection level of every signal line.In addition; Two variable resistor PTC1 and PTC2 reach the function of action consistency except assisting Transient Suppression Diode TVS1, the two poles of the earth gas discharge tube GDT1 and GDT2; Can also effectively suppress to continue the infringement of overcurrent, play the effect of overcurrent-overvoltage duplicate protection equipment.Simple in structure, the low advantage of realization cost that the lightning protection device that the utility model proposes has.
Description of drawings
Fig. 1 is the electrical block diagram of existing a kind of lightning protection device;
Fig. 2 is the electrical block diagram of existing another kind of lightning protection device;
Fig. 3 is the electrical block diagram of the utility model lightning protection device.
Embodiment
The lightning protection device that the utility model proposes is the protection to industrial control system signal and communication circuit, and the safety of protective circuit is kept the normal operating conditions of equipment.
As shown in Figure 3, the lightning protection device that the utility model proposes comprises: two signal line, one of which end are respectively input IN1 and input IN2, and the other end is respectively output OUT1 and output OUT2; Be serially connected in variable resistor PTC1 between input IN1 and the output OUT1, be serially connected in the variable resistor PTC2 between input IN2 and the output OUT2; Be connected the two poles of the earth gas discharge tube GDT1 between input IN1 and the ground, be connected the two poles of the earth gas discharge tube GDT2 between input IN2 and the ground; Be connected the Transient Suppression Diode TVS1 between output OUT1 and the output OUT2; Between output OUT1 and the ground wire, between output OUT2 and the ground wire, connect Transient Suppression Diode TVS2 and Transient Suppression Diode TVS3 respectively.
Wherein, the direction that lightning current that above-mentioned described input and output refer to passes through, but not the input and output indication of signal transmission.
The utility model has adopted the two poles of the earth gas discharge tube GDT1 and the GDT2 of two same model equal order; Be connected over the ground with two signal line respectively; Can from solved existing lightning protection device in essence, adopt one three utmost point gas discharge tube to the unbalanced shortcoming of every signal line protection class; Make the protection magnitude of every signal line equate, thereby play current potential between balanced line better, improve the protection level of every signal line.
In addition, the utility model uses two variable resistor PTC1 and PTC2 to insert in the signal line respectively.When the equipment normal operating conditions that is used with lightning protection device, the resistance of two variable resistor PTC1 and PTC2 is very little; And when having the surge overcurrent in two signal line; The resistance of two variable resistor PTC1 and PTC2 raises rapidly; Surge energy is assembled rapidly at the front end of two variable resistor PTC1 and PTC2; Make the two poles of the earth gas discharge tube GDT1 and GDT2 breakdown faster, reach conducting state, in advance discharge; If exist to continue the overcurrent process in two signal line, two variable resistor PTC1 and PTC2 then can keep high-impedance state, disappear until overcurrent, thereby play overcurrent protection.
Therefore; Two variable resistor PTC1 and PTC2 reach the function of action consistency except assisting Transient Suppression Diode TVS1, the two poles of the earth gas discharge tube GDT1 and GDT2; Can also effectively suppress to continue the infringement of overcurrent, play the effect of overcurrent-overvoltage duplicate protection equipment.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (2)
1. the lightning protection device with over-voltage over-current protection comprises: be serially connected in the Transient Suppression Diode (TVS1) between two signal line; It is characterized in that lightning protection device also comprises: two the two poles of the earth gas discharge tubes (GDT1, GDT2) that are serially connected in respectively between two signal line and the ground wire; Two input and variable resistors between the output (PTC1, PTC2) that are serially connected in two signal line.
2. according to the said lightning protection device of claim 1, it is characterized in that lightning protection device also comprises: be serially connected in two Transient Suppression Diodes (TVS2, TVS3) between two signal line and the ground wire respectively with over-voltage over-current protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202083744U CN202121317U (en) | 2011-06-20 | 2011-06-20 | Lightning protection device having overvoltage and overcurrent protection functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202083744U CN202121317U (en) | 2011-06-20 | 2011-06-20 | Lightning protection device having overvoltage and overcurrent protection functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202121317U true CN202121317U (en) | 2012-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202083744U Expired - Fee Related CN202121317U (en) | 2011-06-20 | 2011-06-20 | Lightning protection device having overvoltage and overcurrent protection functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202121317U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887786A (en) * | 2013-04-28 | 2014-06-25 | 上海伊莱克斯实业有限公司 | Lightning protection device protecting RS485 transceivers |
| CN104485654A (en) * | 2014-12-29 | 2015-04-01 | 李银龙 | Novel lightning protection circuit for intelligent ammeter |
| CN104578016A (en) * | 2015-01-09 | 2015-04-29 | 青岛鼎信通讯股份有限公司 | High-voltage protection solution for fire control bus entry |
| CN106711985A (en) * | 2016-12-24 | 2017-05-24 | 大连尚能科技发展有限公司 | Circuit board used for preventing surge of signals |
| CN113467189A (en) * | 2020-03-31 | 2021-10-01 | 北京科益虹源光电技术有限公司 | Signal switching unit of photoetching machine excimer laser |
-
2011
- 2011-06-20 CN CN2011202083744U patent/CN202121317U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887786A (en) * | 2013-04-28 | 2014-06-25 | 上海伊莱克斯实业有限公司 | Lightning protection device protecting RS485 transceivers |
| CN104485654A (en) * | 2014-12-29 | 2015-04-01 | 李银龙 | Novel lightning protection circuit for intelligent ammeter |
| CN104578016A (en) * | 2015-01-09 | 2015-04-29 | 青岛鼎信通讯股份有限公司 | High-voltage protection solution for fire control bus entry |
| CN106711985A (en) * | 2016-12-24 | 2017-05-24 | 大连尚能科技发展有限公司 | Circuit board used for preventing surge of signals |
| CN113467189A (en) * | 2020-03-31 | 2021-10-01 | 北京科益虹源光电技术有限公司 | Signal switching unit of photoetching machine excimer laser |
| CN113467189B (en) * | 2020-03-31 | 2023-05-23 | 北京科益虹源光电技术有限公司 | Signal switching unit of lithography machine excimer laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120118 Termination date: 20160620 |